3.15.1 node.scheduleUpdate with override update method cause memory increase and can't release

[liuyi]

• cocos2d-x version:3.15.1
• devices test on:ipad
• developing environments
  • NDK version:
  • Xcode version: xcode 9
  • VS version:
  • browser type and version: native app

Steps to Reproduce:

3.15.1 JSB环境 IOS IPAD3 真机测试

测试代码:

var MySprite= cc.Sprite.extend({
ctor:function(){

var _self=this;
_self.scheduleUpdate();
},

//如果不覆盖这个方法，内存不会增长，我记得我使用3.10的时候就发现这个问题
//memory increase always utils crash ,when override this method, just like below.
update:function(deltaTime){

this._super(deltaTime);
}
})；

for(var i=1;i<10;i++){

var sp=new MySprite();
cc.director.getRunningScene().addChild(sp);
}